Occasionally, you’ll get that flight attendant who thinks he or she is funny and sprinkles their safety instruction spiel with a couple of jokes that make you cringe. Given how rote they are, and how many times most of us have heard them during the course of our lives, I still appreciate those efforts, no matter how lame. But this woman — Martha Cobb — she’s hilarious, and she got the ovation from the passengers she deserved.